将数组列表从多个片段传递到活动

Question

I have a follow up question from my previous questions.

My app starts and fragment loads, it passes in the arraylist correctly using interface and listener method .. Now when I click on navigation button to replace current fragment with another fragment... That fragment is exactly the same as first fragment but with different array list... How would I update the arraylist in activity?

I get a classcast exception.

Here are how both of my fragments are implemented

Pass Arraylist from fragment to its own Activity

Answer 1

In terms of the ClassCastException, did you make sure to have your MainActivity(know its MainActivity from MainActivity.java:107) implement the OnFragmentInteractionListener? If you don't that could be why you're getting that ClassCastException, because you're trying to cast your an activity instance(getActivity) to a subclass of which it does not share any inheritance relationship with (OnFragmentInteractionListener)